Method of making paper containers



y 8, 1952 c. BARBIERI 2,602,383

METHOD OF MAKING PAPER CONTAINERS K Filed Jan. 10, 1948 2 SHEETS,-SHEET 1 INV TOR. CESARE BARB/ER! C. BARBIERI 7 METHOD OF MAKING PAPER CONTAINERS July 8, 1952 2 SHEETSSHEET 2 Filed Jan. 10, 1948 INVENTOR. CEsARE BARB/ER! ATTORNY other liquids.

Patented July 8, 1952 METHOD OF MAKING PAPER CONTAINERS Cesare Barbieri, New York, N. Y., assignor to Dixie Cup Company, Chicago, IlL, a corporation of Delaware Application January 10, 1948, Serial No. 1,531

2 Claims.

This invention relates to paper cups or containers- It is necessary that paper containers to be used for hot contents or liquidsbe formed of heavier or thicker material than those used for This is sometimes accomplished by using a blank long enough to form a wall of double thickness or, in other words, to wrap twice around the circumference of the container. The extra material and added time required to form this cup or container materially increase the expense of manufacture. f T

An effort has been made to solve the problem and to provide a container suitable for hot liquids by using a blank of heavier material which is wrapped once around the bottom with the ends overlapped and secured together. This ha not been found to be entirely satisfactory since the stiffer or heavier material tends to unwind or uncurl and to become unglued, this tendency being aggravated by the hot liquid. Furthermore, where the lower portions of the blank ends are overlapped and secured to the bottom, a gap or opening is formed between the outer wrapped edge and the periphery of the flange of the bottom, thus causing a considerable leakage; This necessitates rigid inspection and tests and results in waste of material and product.-

Moreover, in the type of container in which the wall is tapered and a bottom havinga flange is secured thereto, the bottom tends to slide upwardly in the container,due to the interengagin-g tapered surfaces, thus tending to cause leakage. This is particularly true since the flange of the bottom under pressure used to glue the flange to the wall becomes serrated or creased. A further difliculty is encountered in the cup or container with the flanged bottom since the flanged bottom is not always properly centered in the conical or'tapered wall of-the container and an opening and consequent leakage may occur between the tapered bottom flange and the Wall of the container. Also, due to the thickness or stiffness of the material used in'the blank, the inturned end at the bottom of the container wall may become unglued and open up. This invention has for its object against separation from each other and will be securely and tightly sealed and locked to the outer wall of the bottom of the container.

be securely and tightly'sealed within the wall of to provide ac ntainer so constructed that the overlapping ends of the wall will be securely sealed-and locked 2' the tapered container and will be held securely against movement relative thereto.

Another object of the invention' is to provide a tapered or conical container so constructed that the bottom will be securely and tightly locked and sealed in position in such a manner that the container wall will not uncurl or loosen up, causing leakage. I

Another object of the invention is to provide a paper cup or container so constructed that the containers can be nested in a manner to facilitate ready separation of the cups from each other.

Another object of the invention is to provide a method or process of making paper containers, so worked out that the overlapping ends of the blank will be securely sealed and locked against separation from each other and will be securely sealed and locked to the outer Wall of the bottom and, furthermore, so that the bottom will be securely and tightly sealed within the wall of the tapered container and will be held against movement relative thereto.

Further objects of the invention will-appear from the following specification taken in connection with the drawingswhich form a part of this application, and in which Fig. 1 is a plan view of a blank used in making the container constructed in accordance with the invention;

Fig. 2 is an elevational view illustrating in section a blank folded around a mandrel with the bottom held in place, thisfview illustrating the first step. in the methodof making thecontainer;

Fig. 3 is a view similar to Fig. 2 showing the next step in the operation in which the bottom of the container wall is folded inwardly against the flange of the container bottom;

Fig. 4 is a view similar to Figs. 2 and 3 but illustrating the nextstep'inthe operation, showing the lower end of the container wall pressed and secured against the inner surface of the flange of the bottom; 7

Fig. 5 is a view similar to Figs. 2, 3 and 4 but showing the final step in the manufacture of the container and in which the wall of the container is rolled or pressed inwardly under great pressure'aga'inst the upper edge portion of the bottom, thus sealing and locking the container wall and bottom against leakage;

Fig. 6 is an elevational view showing the com-'- pleted container; i

Fig. 9 is a sectional elevation similar to Fi '7 but showing the bottom mounted in the container with the flange extending upwardly in the con-' tainer and the wall of the container pressed inwardly and locked against the lower edge portion of the bottom;

Fig. 10 is a fragmentarysectional elevation showing, in exaggerated form, the overlapping ends of the blank and the adjacent portion of the bottom, this view being added for the purpose of showing the gap between the outer wall of the blank and the adjacent portion of the bottom;

Fig. ,11 is a view similar, to Fig. 1.07 but showing the parts in the position taken after the container wall has been rolled or pressed inwardly under great pressure against the outer edge portion of the bottom to lock these parts together and close the gap shown in Fig. 10;

Fig. 12 is a top plan view of a portion of the container constructed as shownin Fig. .9, illustrating the creased or serrated condition of the upwardly extending bottom flange due to the deformation of the paper in drawing the flange which is retained in its deformed condition by the pressure used in gluing or securing the bot- '1 tom flange inside the container wall;

4 against the inner surface of the flange 21, as shown in Fig. 4.

It will be understood that after the end or" the blank 20 having glue thereon, as shown at 2!, is folded around the mandrel, the glued portion 2! will be held against and secured to the outer surface of the other end of the blank.

When the operation hasbeen carried out to the extent hereinbefore described, there is formed between the outer lap 36 of the container wall and the outer surface 3! of the flange 21, a gap,

shown in exaggerated form, at X in Fig. 1D.

This invention has for its salient object to close the gap X and to securely seal and lock Fig. 13 is a longitudinal sectional elevation through the bottom portion of the containershown inFig. 9 after the container wall has been rolled or pressed in annular-1y against the edge of the bottom; 7

Fig. 14 is a fragmentary sectional elevation, on an enlarged scale, showing the lower edge portion of the mandrel and container wall and bottom prior to the formation of the locking groove and bead in the wall;

Fig. 15 is a view similar to Fig. l lshOWing, in exaggeratedform, the locking groove and bead and adjacent portions of the container wall and bottom; and g Fig. 16 is a sectional elevation showing two containers in nested relation. I

In the particular embodiment of the invention illustrated in the drawings, the container is formed from a blank 20, shown in Fig.1, this blank having adhesive or glue along one end, as shown at 2|, and along the bottom, as shown at '22. I

In the particular embodiment of the invention illustrated in Figs. 2 to 8 and 14 to 16 inclusive, the blank 20 is-folded around a conicalmandrel and around a bottom 26 having .a downwardly extending tapered flange 21. It will be understood that the bottom is supported below the mandrel in any suitable manner as theblank is folded around the mandrel.

After the blank has been folded inthe manner set forth around the mandrel and around the flange '21v of'the bottom 26, the second step in the operation iscarried out, as shown inFig. 3. In this step the. lower end portion 28 of; the container wall is folded inwardlyand upwardly around the flange 21, as shown;at 29 in Fig. 3. Thisinturned end of the lower portion 28 of the container wall is then pressed and glued tightly the wall of the container to the outer surface of the bottom flange 21 and against the upper outer edge portion of the bottom 25. Referring particularly to the embodiment of the invention illustrated in Figs. 1 to 8 and 13 to 16 inclusive, this is accomplished by forming an annular, in wardly extending bead 32 in the wall of the container at the point where the wall abuts the outer edge portion of the bottom 26. This annular groove or inwardly extending bead is formed by exerting heavy pressure, by a roller or suitable tool, against the outer surface of the wall opposite an annular groove 33 formed in the lower edge portion of the mandrel 25, thus pressing the material of the wall into this groove,

' stretching the material of thewall, and forcing it inwardly to close the gap X and press the wall of the container into tight sealing relation with reference to the flange '27 and the upper edge portion of the bottom 26. g

It will be noted that the groove 33 in the lower edge portion of the mandrel has an are approximately one-half of a semicircle and when the wall of the container is grooved to form the bead 32, approximately one-half of the bead is disposed above the plane of the top 26 of the bottom and the other half is disposed below said plane and extendsinto, the flange 21 of the bottom.

Under this. heavypressure the gap X, shown in Fig. 10, is closed, and the overlapping portions of, the container wall are tightly held, sealed and locked against the container-T bottom. At the time this grooving operation is .-carried out the glue or adhesive has not dried and set and the paper is still moist and pliable. This operation eifectively prevents. leakage and the seal is made even tighterwhen hotliquid isplaced in the container since the hot. liquid will cause the bead 32 to tend to open up or widen, thus pressing the wall .even, more tightly against/the upper outer edge of the bottom ZBand flange 21.

vIn order topermit the containers to nest in the manner shown in Fig. 16, the bottom edge of the container is bent inwardly, as shown at 34,. so that. this inwardly bent loweredge will rest on the bead-32 ofthecontainer disposed below the container nested therein.

If desired, the bottom of the container may be disposed; in the mannershown in FigsLQ- and 13,, namely, with the flange 2'! extending upwardly instead of downwardly. 'In this casethe lower end of the container wall,.is;folded-inwardly, as shown at 35, the upper-edgeibeing curled over to -form; a support for vthe'container bottom v26. When this bottom; shown-in Fi Q is drawn to form theflange 27, theinaterialgof the flange often. becomes deformed, creased :or

wrinkled, ias shown in; Fig.c13;;and. due "tothis creased flange not being .seale'datightly -Saga-inst the inner wall-yof'the container the liquidsometimes escapes. In order to overcome this-condition and to further lock the bottom against movement in the container, the wall of the container has formed therein an annular, inwardly extending bead 36, similar to the bead 32 above explained. The bead 36 will be pressed into, tight sealing and locking engagement with the outer edge portion of the bottom shown in Fig. '9, thus effectively sealing the contact between the lower edge of the bottom and the adjacent portion of the bottom flange and the container wall. In order to form the bead 36 the mandrel will have a groove similar to groove 33 opposite the portion of the wall where the bead is to be formed.

From the foregoing description it will be clear that the flanged container bottom and the inner surface of the container wall will be securely held in tight sealing and locking relation and that the bottom cannot move upwardly relative to the container and the outer overlapping end of the container wall will be effectively held in tight sealing relation against the outer and upper edge portion of theflange and bottom of the container bottom. g

Although certain specific embodiments of the invention have been particularly shown and described it will be understood that the invention is capable of modification and that changes in the construction and in the arrangement of the various cooperating parts may be made without departing from the spirit or scope of the invention, as expressed in the following claims.

What I claim is:

1. The method of making a paper container which consists of wrapping a blank around a conical mandrel and around a flanged bottom, with the ends of the blank overlapping, securing the outer end to the overlapped portion of the wall and the container wall to the flange of the bottom, folding the bottom edge of the wall of the container so formed inwardly and upward- .6 1y against the bottom, and forcing the container wall inwardly above the flat surface of the bot-- tom, inwardly at the periphery of the bottom and forcing the Wall and flange inwardly below the plane of the flat bottom, thereby sealing the container wall to the bottom and locking the bottom in position.

2. The method of locking and sealing a container wall against the upper edge and flange of a flanged bottom secured within the container wall and held in position by an inturned flange on the bottom of the container wall, which consists of forcing the container wall inwardly above, at and below the upper peripheral portion of the bottom and forming an inwardly extending annular bead depressed into the flange and over the peripheral portion of the bottom.

CESARE BARBIERI.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS 

